A Study of Network Throughput Gain in Optical-Wireless (FiWi) Networks Subject to Peer-to-Peer Communications

Abstract

Optical-Wireless (FiWi) access network is a newly emerged access network architecture which integrates passive optical networks (PONs) with wireless mesh networks (WMNs) to provide the ubiquitous, low cost, high bandwidth last mile Internet access. Though the PON subnetwork of FiWi network can provide high bandwidth, the interference in the wireless subnetwork still limits the throughput of FiWi network if all traffic goes online to the Internet. However, when peer-to-peer communication from one wireless client to another wireless client is introduced, the proposed integration of PONs and WMNs can significantly improve the network throughput. In traditional WMNs, peer-to-peer communication from one wireless client to another wireless client is carried in the wireless network, which is subject to interferences in wireless communications. In FiWi network, peer-to-peer communication can be carried through the wireless-optical-wireless mode in which the traffic is sent from the source wireless client to its nearest ONU, which is then sent to the ONU close to the destination wireless client through the PON subnetwork and then delivered to the destination wireless client. Such wireless-optical-wireless communication mode introduced by FiWi networks can sustain the interference in wireless subnetwork, thus improving the network throughput. This paper aims to study the network throughput gain in FiWi network subject to peer-to-peer communications and parameters which can affect the network throughput gain. We first have a fair modeling of FiWi networks and traditional WMNs. We then present an LP based routing algorithm for FiWi networks. Extensive simulations have been carried to study the network throughput gain in FiWi networks subject to peer-to-peer communications compared with traditional WMNs. The work provides insightful observations for fully utilizing advantages brought by the integration of PONs and WMNs in FiWi networks.

A Review on Cost-Efficient and Optimum Solution for Fiber-Wireless (Fi-Wi) Technology

“…After applying GA and steps of first algorithm only 4 ONUs are required in the network. They are Onu 5 , Onu 6 , Onu 7 , Onu 10 and Onu 11 with best position, as shown in Fig.3 …”

Shortest propagation delay (SPD) first scheduling for EPONs with heterogeneous propagation delays

“…An interesting avenue for future research arises from the convergence of fiber-based and wireless access networks, see e.g., [63], [64], which will potentially cover large geographic areas and thus have highly heterogeneous propagation delays. Further, the integration of medium access control on the fiber and wireless media may lump the propagation delay on the fiber and the wireless medium access delay together to lead to additional diversification of the round-trip delays experienced by the OLT.…”

FiWi Access Networks Based on Next-Generation PON and Gigabit-Class WLAN Technologies: A Capacity and Delay Analysis

“…For comparison to [5], we consider peer-to-peer (P2P) traffic, where each frame generated by a given STA is destined to any other of the remaining 15 STAs with equal probability 1/15, and upstream traffic, where all frames generated by the STAs are destined to the OLT. Fig.…”

“…Among others, the beneficial impact of advanced hierarchical frame aggregation techniques on the end-to-end throughput-delay performance of an integrated Ethernet passive optical network (EPON)/wireless mesh network (WMN)-based FiWi network was demonstrated by means of simulation and experiment for voice, video, and data traffic [4]. A linear programming based routing algorithm was proposed in [5] and [6] with the objective of maximizing the throughput of a FiWi network based on a cascaded EPON and single-radio single-channel WMN. Extensive simulations were conducted to study the throughput gain in FiWi networks under peer-to-peer traffic among wireless mesh clients and compare the achievable throughput gain to conventional WMNs without any optical backhaul.…”